JPH0348075B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for modifying the hull of a large oil tanker or the like for use as a floating dock.

Traditionally, large oil tankers have often had to be laid up due to the shift to an era of low economic growth, and as the cost of mooring and maintenance increases, measures have been taken to reuse them for other purposes. It is hoped that this will be achieved.

The present invention is intended to meet such demands, and aims to provide a method for efficiently converting the hull of a large oil tanker or the like into a floating dock so that it can be reused.

Therefore, in the method of the present invention, when converting a ship's hull into a floating dock, after cutting off a required part of the upper deck of the ship, the cut-off upper deck member is connected so that the lower crossbeam of the upper deck is connected to the bottom crossbeam. It is characterized by being shifted in the longitudinal direction by half the center distance and being moved onto the bottom of the ship as a dotwell inner bottom plate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figures 1 to 3 show an example of the hull before modification, with Figure 1 being a side view, Figure 2 being a plan view, and Figure 3 being a plan view. It is a sectional view taken along the − arrow in FIG. 2;
4 and 5 show a floating dock modified by the modification method as the first embodiment of the present invention, FIG. 4 is a plan view thereof, and FIG. 6 and 7 show a floating dock remodeled by the remodeling method as a second embodiment of the present invention, FIG. 6 is a plan view thereof, and FIG.
8, 9, 10, and 11 are plan views showing floating docks remodeled by the remodeling methods as the third, fourth, fifth, and sixth embodiments of the present invention, respectively; Figures 1 to 14 show the modification procedures in the first embodiment of the present invention. Figure 12 is a cross-sectional view of the hull before modification, Figure 13 is a cross-sectional view of the floating dock after modification, and Figure 14 is a cross-sectional view of the floating dock after modification. FIG. 14 is a sectional view taken along the - arrow in FIG. 13;

As shown in Figures 1 to 3, the hull of a large oil tanker is provided with an engine room 1, a living quarters 2, and a bow ballast tank 3, as well as a plurality of cargo oil tanks A below the upper deck 4. It is being

Each oil tank A is surrounded by an upper deck 4, a bottom skin 5, and a side skin 6, and a plurality of transverse bulkheads 7.
and is divided by a longitudinal bulkhead 8.

In the first embodiment of the present invention, the bow portion 9 of the hull shown in FIGS. 1 to 3 is cut and removed at an appropriate position 10 to provide a dock well 11, as shown in FIGS. 4 and 5.

This dock well 11 has a side wall 12, a rear end wall 1
6 and an inner bottom plate 13, which are the longitudinal bulkhead 8 and transverse bulkhead 7 of the old hull, respectively.
and upper deck 4, especially the longitudinal bulkhead 8.
The upper deck 4 will be used by cutting and moving the required parts.

Also, the empty space 14 around the dockwell 11 and the old oil tank are used as a ballast tank 15 for controlling the attitude of this floating dock.

Next, the remodeling method of the present invention will be explained in more detail with reference to FIGS. 12 to 14. When relocating the longitudinal bulkhead 8, the hatched portion 19 of the crossbeam shown in FIG. The deck 4 is cut longitudinally at positions 20.

Further, after cutting the underdeck transverse beam 21 along the inner surface of the longitudinal bulkheads 8, 8 at a position 22, and cutting the longitudinal bulkhead 8 and the cross beam 23 attached thereto at a position 24, Move the longitudinal bulkhead 8 and the transverse beam 23 to appropriate longitudinal member positions in the ship's direction, and move the longitudinal bulkhead 8 and the transverse beam 23
5 at position 27, and the bottom transverse beam 26 at position 2.
Join at 8.

Further, the upper deck 4 and the lower deck crossbeam 21 are moved downward and used as the inner bottom plate 13 of the double bottom structure 29.

In this case, the upper deck 4 and the lower deck crossbeam 21 are
By shifting 1/2 frame (that is, half the frame spacing) in the longitudinal direction and joining it to the bottom crossbeam 30, the frame spacing appears to be half that of the old structure, as shown in Figure 14, and the new material The strength of the double bottom can be increased while minimizing the input of

Figure 6 (side view) and Figure 7 (-
In the second embodiment of the present invention shown in the arrow sectional view),
A dock well 11 is provided on the side of the ship, and this dock well 11 is connected to the side wall 12 and the rear end wall 1.
6. It is composed of a front end wall 17 and an inner bottom plate 13.

In this modified example, the mooring device at the bow of the old hull can be used as is, and the upper deck can be replaced with the inner bottom plate.
3 will be relocated, but the side wall 12
This has the advantage that the longitudinal bulkheads of the old hull can be used as they are without having to be relocated.

In the case of this second embodiment as well, when relocating the upper deck as the inner bottom plate 13 of the dockwell, the lower transverse girder of the upper deck should be aligned with respect to the bottom transverse girder, as in the case of the first embodiment described above. The above-mentioned relocation is performed while shifting in the front-back direction by half the distance.

In the third embodiment of the present invention shown in FIG. 8, from the viewpoint of improving longitudinal strength, the hull is shortened and converted into a floating dock, and the central parallel part of the hull is removed and the bow section is and the stern part are joined, and a dock well 11 is formed in the ship side part so as to be surrounded by a side wall 12, a rear end wall 16, a front end wall 17, and an inner bottom plate 13.

In this case as well, a modification work is carried out in which the upper deck of the old hull is relocated as the inner bottom plate 13, as in the case of each of the above-described embodiments.

In the fourth embodiment of the present invention shown in FIG. 9, the stern part is removed and a dock well 11 is provided on the stern side, contrary to the case of the first embodiment shown in FIG. The details of the modification work are almost the same as in the case of the first embodiment described above.

In addition, in the fifth embodiment of the present invention shown in FIG. 10, dock wells 11 are provided at each of the bow and stern parts of the ship in order to reduce the need for reinforcement work for longitudinal strength. is almost the same as in the case of FIGS. 6 and 7.

Furthermore, in the sixth embodiment of the present invention shown in FIG. 11, the bow section 9 and the stern section 18 are cut and removed at appropriate positions, and a dock well 11 is provided over the entire remaining central parallel section of the hull. However, the modification work is carried out in accordance with the first embodiment (FIG. 4) and the fourth embodiment (FIG. 9) described above.

As described in detail above, according to the method of converting a ship hull into a floating dock according to the present invention, after cutting off a required portion of the upper deck of the ship hull, the cut-off upper deck member is connected so that the lower crossbeam of the upper deck is at the bottom of the ship. By simply moving the plate onto the bottom of the ship as the inner bottom plate of the dockwell while shifting it longitudinally by half the center distance relative to the crossbeam, we were able to provide sufficient strength to the bottom of the dockwell while minimizing the use of new materials. This has the advantage of making it possible to carry out remodeling work into floating docks, and efficiently reusing large oil tankers that are no longer needed.

[Brief explanation of drawings]

Figures 1 to 3 show an example of the hull before modification, with Figure 1 being a side view, Figure 2 being a plan view,
FIG. 3 is a sectional view taken along the - arrow in FIG. Figures 5 and 5 are cross-sectional views taken along the - arrow in Figure 4, and Figures 6 and 7 show a floating dock remodeled by the remodeling method as the second embodiment of the present invention. The plan view, Figure 7, is the same as Figure 6.
8, 9, 10, and 11 are plan views showing floating docks remodeled by the remodeling methods as the third, fourth, fifth, and sixth embodiments of the present invention, respectively; Figures 1 to 14 show the modification procedures in the first embodiment of the present invention. Figure 12 is a cross-sectional view of the hull before modification, Figure 13 is a cross-sectional view of the floating dock after modification, and Figure 14 is a cross-sectional view of the floating dock after modification. FIG. 14 is a sectional view taken along the - arrow in FIG. 13; 1...engine room, 2...accommodation area, 3...ballast tank, 4...upper deck, 5...bottom shell, 6...ship side shell,
7...Transverse bulkhead, 8...Longitudinal bulkhead, 9...Fore part, 10
...cutting position, 11...dock well, 12...side wall,
13...Inner bottom plate, 14...Vacancy, 15...Ballast tank,
16... Rear end wall, 17... Front end wall, 18... Stern part, 1
9...Shaded part to be cut and removed, 20... Upper deck cutting position, 21... Lower deck crossbeam, 22... Cutting position, 23
... Cross beam with longitudinal bulkhead, 24 ... Cutting position, 25 ... Ship side cross beam, 26 ... Bottom cross beam, 27, 28 ... Joining position, 29 ... Double bottom structure, 30 ... Bottom cross beam, A ... Oil storage tank.

Claims (1)

[Claims] 1. When converting a ship into a floating dock, after cutting out the required part of the upper deck of the above-mentioned ship, the upper deck lower transverse girder shall be moved forward and backward by half the center distance from the bottom transverse girder. A method for converting a ship's hull into a floating dock, which is characterized by moving the ship's hull to the bottom of the ship as an inner bottom plate of a dockwell in a shifted state.